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Typical weather in Chicago, IL (Illinois), USA on May 18

High Temperatures

On May 18 in Chicago, IL (Illinois), USA the average high temperature is 70.8 °F (21.6 °C). The lowest recored high temperature was 45.0 °F (7.2 °C) in 1969 and the highest recored high temperature was 93.9 °F (34.4 °C) in 1996. The high temperature is usually* between 63.2 °F (17.3 °C) and 78.4 °F (25.8 °C). About a quarter of the time, the high temperature is less than 63.2 °F (17.3 °C), and another quarter of the time, the high temperature is greater than and 78.4 °F (25.8 °C). About 95% of the time, the high temperature has been between 48.7 °F (9.3 °C) and 92.9 °F (33.8 °C).

Low Temperatures

On May 18 in Chicago, IL (Illinois), USA the average low temperature is 51.3 °F (10.7 °C). The lowest recored low temperature was 34.0 °F (1.1 °C) in 2002 and the lowest recored low temperature was 74.8 °F (23.8 °C) in 1996. The low temperature is usually* between 45.7 °F (7.6 °C) and 56.9 °F (13.8 °C). About a quarter of the time, the low temperature is less than 45.7 °F (7.6 °C), and another quarter of the time, the low temperature is greater than and 56.9 °F (13.8 °C). About 95% of the time, the low temperature has been between 35.1 °F (1.7 °C) and 67.5 °F (19.7 °C).

Frost

On May 18 in Chicago, IL (Illinois), USA expect the temperatures to drop below freezing for a risk of frost about 1.0% of the time.

Usually* in this context means around 50% of the time, assuming a normal distribution of values.

Data Source(s)

The data used to compute the average high/low temperatures for this location were taken from the following stations: